Adjective in the neuter nominative/accusative plural: literally "going out", (cf. epsilon 1777) from e)/ceimi "go out." Same or similar glossing in other lexica, commenting on Gregory of Nazianzus PG36.608a, where it occurs. See also Lucian, How to Write History 54 (glossed as here), which quotes the best-known instance of all, from the preface of Herodotus (1.1: web address 1).